Hi Adrienne , they were sisters , best to go to Frances' A Manx Note Book - on line then search for William Fine , as well as his will there is a lot of other information .
The will names his 5 daughters , in order Jane, Sarah, Christian (Christina , Christianna) Elizabeth & Ann , all the births are on the IGI , others include William 1729-30 , Margaret 1732-33 , and John 1720 and Mary 1738 who both must have died before 1762. William Fine's wife was Dorothy Christian. Christian Fine married Samuel Smith 1749 Douglas and John Kelly in 1758 Kirk German.
Cheers
David Dwyer